Sep 29: Two Kinds of for Loops

Learning Objectives

After today's class, you should be able to:

Explain the syntax and the purpose of a for statement.
Predict how range() works given 1, 2, or 3 arguments.
Explain the difference of iterating values versus indexes.

Announcements¶

Read Ch 6 – ideally:
- 1st half before Friday
- 2nd half before Monday
Submit HW 6 – ideally:
- 1 and 2 before Friday
- 3 and 4 before Monday

POGIL Activity¶

For Loops
- If you are absent today, complete this activity at home
- Bring your completed activity to class or office hours

Example Code¶

Model 1

print("hello")
for x in [2, 7, 1]:
    print("the number is", x)
print("goodbye")

Question 8

for c in "Hi!":
    print(c)

Model 2

range(5)
list(range(5))
x = range(3)
print(x)
print(list(x))
list(range(5, 10))
list(range(-3, 4))
list(range(4, 10, 2))
for i in range(5):
    print(i)

Model 3

names = ["emma", "liam", "aisha", "mateo", "sofia", "ravi"]

for i in range(len(names)):
    name = names[i]
    # replace element at index i
    names[i] = name.capitalize()

Question 24

prices = [19.99, 6.34, 1.00, 12.79, 2.50]